Product Theme - custom header

I have searched and can't seem to find an clear answer for this. I am new to WPMU.

Is it possible to have a custom header for this theme and if so how is it done in this theme?
I am using the child theme with the default css and customising colours through the custom styling option.

Also another strange thing on my wide screen (1920×1080) using IE8 when I click groups the body (not sure how to refer to it) jumps to the far left and with all other tabs (activity, members, forums, blogs) it is centered. It doesn't do this on Google Chrome.